Outlook Meeting Invite - Accept and Decline Buttons Disapeared

I have several users, 3 out of 8, that are unable to accept updates to an existing, recurring Outlook 2007 meeting.  The "respond" portion of the ribbon bar with the Accept, Tentative, Decline buttons is not visible at all.  The "other" 5 users who are part of the meeting invite are able to accept the update without any issues utilizing the Accept button.  Users who do not get the Accept/Decline buttons do not report any other issues with Outlook.

All attendees are domain members and use company (domain) email address.
No external invitiees.
Exchange 2003 w/current SP and udpates.
Outlook 2007, SP3.
No internet calendars involved.
Organizer, invitees and Exchange have all rebooted.
Some users have had OST renamed to force new OST creation.
Have not tried recreating local Outlook profiles...yet.
Looking for some direction and troubleshooting options.
sasoloAsked:
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sasoloConnect With a Mentor Author Commented:
We just got done with an migration to Exchange 2010...on our way to 2013.  So far no recurrance of the issue.
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EEhotlineCommented:
Try these steps to troubleshooting:
1.       Repair Office
2.       Turn off Cached Exchange Mode
3.       Create a new profile
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sasoloAuthor Commented:
I was just able to run the Office Repair last night and unchecked Exchange Cached Mode.  The most recent meeting invite does not appear any different (the Accept/Deny buttons do not show).

Right now I'm waiting for the organizer to make a change and send out an update to see if this resolved the issue.
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sasoloAuthor Commented:
Closed out the question due to our ongoing migration from Exchange 03 to 13...
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